# physic

Popular questions
1. ## Physic

A spring 20cm long is stretched to 25cm by a load of 50N.What will be its length when stretched by 100N assuming that the elastic limit is not reached?

asked by Bamiduro on May 15, 2014
2. ## Physic

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle è = 40° with the horizontal. The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on

asked by Don on September 28, 2011
3. ## Physic

You walk 55 m to the north, then turn 60° to your right and walk another 46 m. How far are you from where you originally started? Can someone help me with this question please? I have tried Pythagorean but it did not work. thank

asked by John Yi on August 28, 2012
4. ## physic

two point charges are placed on the x axis as follows: charge q1 = +4.00 nc is located at x = 0.200 m, and charge q2 = +5.00 nc is at x = -0.300 m what ae the magnitude and direction of the net force exerted by these two charges on a negative point charges

asked by yanis on February 13, 2013
5. ## physic

A force F⃗ = 12 N i^ − 10 N j^ acts on an object. How much work does this force do as the object moves from the origin to the point r⃗ = 13 m i^ + 11 m j^?

asked by kolam on July 13, 2013
6. ## physic

a tank contains 26.0 kg of oxygen gas at a gauge pressure of 8.70 atm. if oxygen is replaced by helium, how many kilograms of the latter will be needed to produce a gauge pressure at 7.00 atm?

asked by yuri on October 12, 2010
7. ## physic

Superman must stop a 120km/h train in 150m to keep it from hitting a stalled car on the tracks.If the train's mass is 3.6x10^5kg,how much force must he exert?Compare to the weight of the train (give as%).How much force does the train exerts on Superman?

asked by noah on July 2, 2011
8. ## physic

Calculate the pressure exerted on the ground by a79kg person standing on one foot. Assume that the bottom of the person's foot is 13cm wide and 28cm long.

asked by steve on July 21, 2010
9. ## Physic

What is the period of revolution of a satellite with mass m that orbits the earth in a circular path of radius 7820 km (about 1450 km above the surface of the earth)?

asked by Andrea on July 10, 2010
10. ## Physic

Two resistors when connected in series to a 120-V line use one-fourth the power that is used when they are connected in parallel. If one resistor is 4.8 kohms. what is the resistance of the other?

asked by Allen on April 12, 2015
11. ## Physic

A dam is used to block the passage of a river and to generate electricity. Approximately 58.4 x 103 kg of water falls each second through a height of 20.1 m. If one half of the gravitational potential energy of the water were converted to electrical

asked by Monet Nguyen on October 13, 2012
12. ## PHYSIC

A body accelerate uniformly from rest at 2ms-2 .calculate it,s velocity after travelling 9m

asked by DAVID on October 17, 2018
13. ## physic

Planet A and planet B are in circular orbits around a distant star. Planet A is 4.5 times farther from the star than is planet B. What is the ratio of their speeds vA/vB?

asked by ozer on July 13, 2013
14. ## physic

Two blocks are connected by a rope that passes over a massless and frictionless pulley as shown in the figure below. Given that m1 = 18.04 kg and m2 = 10.57 kg, determine the magnitudes of the tension in the rope and the blocks' acceleration. T = N a =

asked by joy on February 5, 2018
15. ## physic

A golfer hits his approach shot at an angle of θ = 52.8°, giving the ball an initial speed of v0 = 37.0 m/s (see figure below). The ball lands on the elevated green, yf = 5.3 m above the initial position near the hole, and stops immediately. (a) How much

asked by joy on January 31, 2018
16. ## Physic

A plane progressive wave is represented by the equation: y= 0.1sin(200pi(t)-20pi/15(x)) where y is the displacement in metres, t is in seconds and x is the distance from a fixed origin O in metres. Find (i) the frequency of the wave, (ii) its wavelength

asked by Johm on August 26, 2013
17. ## physic

Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm.

asked by mert on July 11, 2013
18. ## physic

Starting from rest, a car accelerates at 2.5 m/s^2 up a hill that is inclined 5.4 ^\circ above the horizontal. how far the car travel horizontally in 15s?

asked by Anonymous on July 2, 2011
19. ## Physic

A 61-kg skier, coasting down a hill that is an angle of 23 to the horizontal, experiences a force of kinetic friction of magnitude 72N. The skier's speed is 3.5m/s near the top of the slope. Determine the speed after the skier has travelled 62m downhill.

asked by Tristan on August 14, 2013
20. ## physic

two particles moving along x-axis in the same direction with uniform velocity is 8 metre per second and 4 metre per second initially the first particle is 21 m to the left of the origin and the second one is 7 m to the right of the origin to particle meets

asked by ruchiket on August 3, 2017
21. ## physic

The figure below shows a box of dirty money (mass m1 = 4.0 kg) on a frictionless plane inclined at angle θ1 = 35°. The box is connected via a cord of negligible mass to a box of laundered money (mass m2 = 2.0 kg) on a frictionless plane inclined at angle

asked by joy on February 27, 2018
22. ## Physic

1. Water at a pressure of 3.00 x 10 5th Pa flows through a horizontal pipe at a speed of 1.00 m/s. The pipe narrows to one-fourth its original diameter. What is the speed of the flow in the narrow section? Not sure was successfully posted

asked by Leo on December 5, 2012
23. ## physic

Need Help please. Consider the following mass distribution where the x and y coordinates are given in meters: 5.0 kg at (0.0, 0.0) m, 3.0 kg at (0.0, 4.3) m, and 4.0 kg at (2.8, 0.0) m. Where should a fourth object of 8.2 kg be placed so the center of

asked by Chan on November 23, 2009
24. ## physic

A stone is dropped from the roof of a high building. A second stone is dropped 1.00s laterHow far apart are the stones when the second one has reached a speed of 12.0m/s ?

asked by cuzer on July 6, 2013
25. ## Physic

A 75-W, 120-V bulb is connected in parallel with 25-W, 120-V bulb. What is the net resistance?

asked by Allen on April 9, 2015
26. ## Physic

A penny on its side moving at speed v slides off the horizontal surface of a table a vertical distance y from the floor. a) Show that the penny lands a distance v√(2y/g) from the base of the coffee table. b) If the speed is 3.5 m/s and the coffee table

asked by Kay on November 7, 2014
27. ## physic

A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 22 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

asked by joy on February 1, 2018
28. ## physic

A pair of students are lifting a heavy trunk on move-in day. (Figure 1) Using two ropes tied to a small ring at the center of the top of the trunk, they pull the trunk straight up at a constant velocity v⃗ . Each rope makes an angle θ with respect to

29. ## Physic

Consider the equation v = (1/4)zxt^2. The dimensions of the variables v, x, and t are [L]/[T], [L], and [T], respectively. The numerical factor 4 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the

asked by isalbelle on September 5, 2013
30. ## physic

Two currents from different sources flow in opposite directions through a resistor. I1 is measured as 79 mA on a 100 mA analog instrument with an accuracy of ±3% of full scale. I2, determined as 31 mA, is measured on a digital instrument with a ±100 µA

asked by mary on April 6, 2017
31. ## physic

You are driving into St. Louis, Missouri, and in the distance you see the famous Gateway-to-the-West arch. This monument rises to a height of 192 m. You estimate your line of sight with the top of the arch to be 7.37 ° above the horizontal. Approximately

asked by Anonymous on September 9, 2012
32. ## physic

A sensitive gravimeter at a mountain observatory finds that the free-fall acceleration is 7.00×10^-3 m/s^2 less than that at sea level. What is the observatory's altitude?

asked by peggy on December 4, 2009
33. ## physic

if you apply a force of 1.0N to a cart of mass 1.0kg with negligible friction, what do you expect the acceleration to be?

asked by wiki on October 18, 2009
34. ## physic

A circus performer stands on a platform and throws an apple from a height of 49 m above the ground with an initial velocity v0 as shown in the figure below. A second, blindfolded performer must catch the apple. If v0 = 30 m/s, how far from the end of the

asked by joy on January 30, 2018
35. ## physic

The position function x(t) of a particle moving along an x axis is x = 6.00 - 8.00t2, with x in meters and t in seconds. (a) At what time and (b) where does the particle (momentarily) stop? At what (c) negative time and (d) positive time does the particle

asked by sara on September 26, 2015
36. ## Physic

If a scuba diver fills his lungs to full capacity of 5.5LL when 8.2mm below the surface, to what volume would his lungs expand if he quickly rose to the surface? Assume he dives in the sea, thus the water is salt.

asked by Anonymous on May 10, 2014
37. ## physic

Search: The barrels of the 16 in guns (bore diameter = 16 in. = 41 cm) on the World War II battleship U.S.S. Massachusetts were each 15 m long. The shells each had a mass of 1050 kg and were fired with sufficient explosive force to provide them with a

asked by Anonymous on October 14, 2010
38. ## Physic

A fan at a rock concert is 30 m from the edge of the stage. The sound intensity level at the edge of the stage is 110 dB. The fan's eardrums have a diameter of 8.4mm. How much energy is transferred to each eardrum in one second? (Hint: It may help to asume

asked by Jimmy on November 7, 2009
39. ## physic

Suppose a block of lead of mass 0.4kg at temperature of 95°C is dropped in 2kg of water originally at 20°C in a container. Calculate the final temprereture if no heat is lost to the container and enviroment ;(specific heat of lead is 128j/kg°C and water

asked by stanis frank on March 27, 2017
40. ## physic

A tennis ball is projected horizontally from the top of a cliff 50m high with a velocity of 10ms -1 , find (a) the time taken to reach the ground (b) the distance from the foot of the cliff to where the ball hits the ground.

asked by jaja on August 16, 2016
41. ## physic

A 2000 kg car is traveling at 20.0 m/s. Then, it puts on the brakes and comes to a complete stop. The heat generated due to the stopping heats up the brakes. The mass of the brake system is 20.0 kg and it has a specific heat of 0.200 kcal/kg °C. What is

asked by aina on July 23, 2016
42. ## physic

A force paralled to an inclined plane is used to raise a load of 500N through a height of 3M While the load moves a distance of 30M along the plane (a) How much work is done on the load ? (b)if the efficency is 80% calculate the effort (c)how much work is

asked by compbell on December 29, 2014
43. ## physic

a skater with moment of inertia 15 kgm2 begins a spin with an angular speed of 6.0 rad/s by changing the position of her arms, the skater decreases her moment of inertia by 50% what is the skaters final angular speed

asked by amro on November 7, 2016
44. ## Physic

A 2.5-kohms and a 3.7-kohms resistor are connected in parallel; this combination is connected in series with a 1.4 kohms resistor. If each resistor is rated at 0.5W (maximum without overheating), what is the maximum voltage that can be applied across the

asked by Allen on April 9, 2015
45. ## PHYSIC

A pole-vaulter just clears the bar at 4.07 m and falls back to the ground. The change in the vaulter's potential energy during the fall is -3900 J. What is his weight?

asked by Anonymous on March 11, 2014
46. ## Physic

A ball is thrown horizontally from a cliff at a speed of 15 m/s and strikes the ground 45 meters from the base of the cliff. How high was the cliff (rounded to the nearest meter)

asked by Unknown on February 27, 2013
47. ## physic

adaobi walks 2km due west and 2km due south calculate the displacement of the girl

asked by tobey on December 12, 2011
48. ## physic

The Moon orbits Earth in a nearly circular orbit that lasts 27.32 days. Determine the distance from the surface of the Moon to the surface of Earth.

asked by joy on February 24, 2018
49. ## physic

A circus performer stands on a platform and throws an apple from a height of 50 m above the ground with an initial velocity v0 as shown in the figure below. A second, blindfolded performer must catch the apple. If v0 = 21 m/s, how far from the end of the

asked by joy on January 30, 2018
50. ## physic

A man walk 3km East and then 4km North what is his resultant displacement? Suppose he walk 3km and 4km 60(degree) North of East. What is the displacement?

asked by Yusuf on March 30, 2017
51. ## physic

a stone A is dropped from the top of tower and B is thrown downward from same point 2 seconds later with initial velocity of 30 ms , if the same stone A and B reach the ground at same time, find height of the tower

asked by Apoorva on July 25, 2014
52. ## Physic

Convert 1kwh to joules

asked by Syam on July 14, 2014
53. ## physic

A rubber ball dropped from a height of exactly 6 ft bounces several times on the floor, loosing 10% of its kinetic energy each bounce. After how many bounces will the ball subsequently not rise above 3 ft

54. ## Physic

The figure below shows a block of mass m resting on a 20¡ã slope. The block has coefficients of friction ¦Ìs = 0.73 and ¦Ìk = 0.53 with the surface. It is connected via a massless string over a massless, frictionless pulley to a hanging block of mass

asked by Jason on March 3, 2014
55. ## Physic

How far apart should two protons be if the electrical force of repulsion is equal to the weight (attraction to the Earth) of one of the protons?

asked by Asiay on January 27, 2014
56. ## physic

a uniform meter stick of mass 100g is pivoted about the 30 cm mark. a mass of 200 g is placed at the 10 cm mark. where should a mass of 50 g be placed so that the meter stick balance horizontally?

asked by visoth on April 25, 2012
57. ## physic

In an experiment, a mass m = 40 gm, attached to a string wrapped around the axle of a flywheel and starting from rest, falls through a distance of 147 cm in 3.5 seconds. The diameter of the axle of the flywheel is 12 cm What is the acceleration of the mass

asked by ashley on March 22, 2012
58. ## physic

A hockey player strikes a puck that is initially at rest. The force exerted by the stick on the puck is 950 N, and the stick is in contact with the puck for 4.4 ms (0.0044 s). (a) Find the impulse imparted by the stick to the puck. (b) What is the speed of

asked by glenmore on December 4, 2011
59. ## physic

In an accidental explosion, a satellite breaks in half while in circular orbit about Earth. One half is brought momentarily to rest. What is the fate of the half brought to rest? What happens to the other half?

asked by bernice on April 21, 2010
60. ## Physic

The back wall of an auditorium is 29.0 m from the stage. If you are seated in the middle row, how much time elapses between a sound from the stage reaching your ear directly and the same sound reaching your ear after reflecting from the back wall?

asked by Jimmy on November 8, 2009
61. ## physic

Billy Bob “Bubba” Hickman is driving along one day messing with his cell phone instead of paying attention to what he is doing. He drives right off of a 25.0 foot high cliff at 42.4 mph. How far from horizontally from the edge of the cliff does his

asked by evan on September 7, 2018
62. ## physic

The figure shows the y-position (in blue) of a particle versus time. (a) What is the average velocity of the particle during the time interval t = 1.50 s to t = 4.50 s? (Express your answer in vector form.) Incorrect: Your answer is incorrect.

asked by joy on January 21, 2018
63. ## Physic

If the energy used to heat up a block of 2kg of copper is 115.8 kJ, what is the temperature it was heated to if the starting temperature was 100oC and the specific heat capacity is 386 J/kgK.

asked by mike on April 27, 2017
64. ## Physic

Show that the function y(x,t) = X^2 + V^2t^2 is a solution of the general wave equation.

asked by Godwin on January 4, 2016
65. ## physic

an object of mass 1.5 kg on a spring of force constant 600N/m loses 3% of its energy in each cycle.THE SYSTEM IS DRIVEn by a sinosuidal force with maximim value of F0=0.5N.(a) What is Q for this system?.(b) What is the resonance (angluar)frequency? (c) If

asked by jjena on November 14, 2011
66. ## physic

The amount of heat released when 100 grams of steam at 100 degrees Celsius is converted into liquid water at 100 degrees Celsius is ____ J.

asked by bode on March 26, 2011
67. ## Physic

If the coefficient of static friction for tires on a road is 0.25, at what maximum speed can a car round a level 47.5 m radius curve without slipping?

asked by Diana on January 3, 2011
68. ## physic

Eight books, each 8.5 cm thick with mass 1.3 kg, lie flat on a table.How much work is required to stack them one on top of another?

asked by Anonymous on October 14, 2010
69. ## physic

A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case. Case A: Thrown straight up. Case B: Thrown straight down. Case C: Thrown out at an angle of

asked by lisa on July 21, 2010
70. ## physic

two figure skaters, one weighting 625N and the other 725N,push off against each other on frictionless ice. a) if the heavest skater travels at 1.50m/s, how fast will the lighter one travel? b)how much kinetic energy is created during the skaters manauver,

asked by kris- on July 20, 2010
71. ## physic

by how many newtons do you increase the weight of your car when you fill up your 11.5 gal gas tank with gasoline a gallon is equal to 3.788 L and the density of gasoline is 737kg/m3

asked by paul on July 20, 2010
72. ## physic

An object attached to the end of a string swings in a vertical circle (R = 1.2 m), as shown. At an instant when ƒá = 30„a, the speed of the object is 5.1 m/s and the tension in the string has a magnitude of 20 N. What is the mass of the object?

asked by yusra on April 18, 2010
73. ## Physic

A violin string has a standard length of 32.8 cm. It sounds the musical note A (440Hz) when played without fingering. How far from the end of the string should you place your finger to play the note C (523Hz)? answer should be in cm.

asked by K. on November 7, 2009
74. ## Physic

Calculate the mass of a bus if it produces o force of 14,000N while accelerating at a rate of 5 m/s^2

asked by Sagar Chhetri on March 12, 2019
75. ## PHYSIC

A train has an initial velocity of 44m/s-2 and acceleration of 4m/s-2 velocity after 10s is

asked by DAVID on October 17, 2018
76. ## physic

a swimmer is capable of swimming at 1.4ms in still water how far downstream will he land if he sweams directy across a 180M wide river

asked by Anonymous on October 17, 2018
77. ## Physic

A meter rule is balanced horizontally on a mass of 30kg hung 20cm from one end. If the position of the knife edge is 18cm from the centre of gravity of the rule. The weight of the rule will be.

asked by Maryann on October 14, 2018
78. ## physic

A student takes the elevator up to the fourth floor to see her favorite physics instructor. She stands on the floor of the elevator, which is horizontal. Both the student and the elevator are solid objects, and they both accelerate upward at 5.15 m/s2.

asked by joy on February 7, 2018
79. ## physic

A particle with mass m = 3.80 kg accelerates according to a = (−2.60i + 1.70j) m/s2. (a) What is the net force acting on the particle? (Express your answer in vector form.) F = N (b) What is the magnitude of this force? N

asked by joy on February 5, 2018
80. ## physic

A circus performer throws an apple toward a hoop held by a performer on a platform (see figure below). The thrower aims for the hoop and throws with a speed of 28 m/s. At the exact moment the thrower releases the apple, the other performer drops the hoop.

asked by joy on January 30, 2018
81. ## physic

Two stones are thrown vertically upwards with the same velocity of 49m/s. If they are thrown one after the other with 3 seconds in between, what is the height at which they collide?

asked by ruchiket on August 4, 2017
82. ## physic

150g of ice at 0 degreecelcius is mixed with 300g of water at 50 degreecelcius.calculate the temperature of the mixture.

asked by damilola on January 24, 2017
83. ## PHYSIC

A bullet is fired in a horizontal direction with a muzzle velocity of 300m\s in the absence of air resistance,how far will it have dropped in travelling a horizontal distance of (a)20m (b)40m (c)60m (d)how far will it drop in one second

asked by JOY on October 22, 2016
84. ## physic

a cold drink bottle of 500 ml weight 25g .when a liquid is filled in it ,it weight 80g .find the density of liquid .

asked by neha on October 19, 2016
85. ## Physic

An object 7.5cm light is placed 30 cm from aconcave mirror of curvature 20cm calculate the 1image distance 2image height

asked by Yusuf aliyu on March 6, 2016
86. ## Physic

A bullet traveling horizontally at a speed of 350m/!@#\$%^&s a board perpendicular to its surface, passes through and emerges on the other side at a speed of 190m/s . If the board is 3.80cm thick, how long does the bullet take to pass through it?

asked by Arneisha on January 30, 2015
87. ## physic

Find the average speed of an automobile that travels 160 km in 2.0 h.

asked by wellington on January 11, 2015
88. ## Physic

A 2.28 kg bucket is attached to a disk-shaped pulley of radius 0.104 m and mass 0.712 kg. If the bucket is allowed to fall, calculate the tension in the rope.

asked by Anonymous on November 15, 2014
89. ## Physic

Show the equation that 100g of 100C steam will completely melt 800g of 0C ice.

asked by Kay on November 9, 2014
90. ## physic

An object of mass m is at rest at the top of a smooth slope of height h and length L. The coefficient of kinetic friction between the object and the surface, μk, is small enough that the object will slide down the slope if given a very small push to get

91. ## physic

The sports car in Figure 6 is travelling along 30 banked road having a radius of curvature of ñ=152 m. If the coefficient of static friction between the tires and the road is µs=0.2, determine the maximum safe speed so no slipping occurs. Neglect the

asked by zainab on March 25, 2014
92. ## Physic

a charge of 1.0x10^-6 uC is located inside a sphere. What is the flux through the sphere?

asked by Belina on February 2, 2014
93. ## physic

Consider a train that rounds a curve with a radius of 570m at a speed of 160 km/h (approximately 100 mi/h)Calculate the friction force needed on a train passenger of mass 75kg if the track is not banked and the train does not tilt.

asked by mert on July 6, 2013
94. ## physic

If you run a complete loop around an outdoor track(400m), in 100 second,what is your average velocity?

asked by syida on July 12, 2011
95. ## physic

4. If the same two dust particles have -1.0 x 10-10 C of charge on one, and +3.2 C x 10-10 C on the other, what is the force between them now? If the force is pushing them apart, show it as a positive number and if it is attracting them together, show it

asked by sabrina on January 21, 2011
96. ## physic

A 0.20 kg ice cube at 0.0° C has sufficient heat added to it to cause total melting, and the resulting water is heated to70deg.Cel. > How much heat is added? (For water Lf=334kj/kg > andLv=2257kj/kg >

asked by kristin on July 24, 2010
97. ## physic

you are designing a diving bell to withstand the pressure of sea water at a depth of 250m. a)what is the quage pressure at the depth(you can ignor the small changes in the density of the water with depth.) b)at the 250m depth, what is the net force due to

asked by ted on July 20, 2010
98. ## Physic

A hockey puck leaves a player's stick with a speed of 8.60 and slides 38.0 before coming to rest. Find the coefficient of friction between the puck and the ice.

asked by Andrea on July 10, 2010
99. ## physic

A 660 N cat burglar is supported by cables in the figure below. Assume the angle è of the inclined cable is 36.0°. Find vertical cable? Thank you so much for your help.

asked by Chan on October 12, 2009
100. ## physic

500 J of work are done in 4 seconds to lift a 40 kg box to the top of a high shelf. How much power was required to complete the lift

asked by cody on June 26, 2018